2021-03-29 12:38 PM
the note says this: The STM32L microcontroller on the board is not intended to be programmed by users. ST provides a preprogrammed firmware image for the sole purpose of interfacing BlueNRG-1, BlueNRG-2 to a USB host device.
2021-03-30 02:40 AM
Please do not get confused by this statement as it refers to the STM32L151CBU6 microcontroller, the purpose of which is merely to provide "the USB to serial bridge providing an I/O channel with the BlueNRG-1, BlueNRG-2 device".
What you probably want to program is the BlueNRG-2.
Regards
/Peter